EUVD-2026-75930
GHSA-46jr-j7fv-fwm3
Severity by source
AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
Stored XSS requires victim page-visit (UI:R per NVD guidance); all other metrics retained as scope change and nonce bypass confirm network, unauthenticated, cross-browser impact.
Primary rating from Vendor (Wordfence).
CVSS VectorVendor: Wordfence
Lifecycle Timeline
2DescriptionCVE.org
The Simple Ajax Chat - Add a Fast, Secure Chat Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Chat Message in all versions up to, and including, <= 20260811 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The nonce protecting chat message submission is publicly visible on the chat page, rendering it ineffective as an authentication barrier and allowing fully unauthenticated attackers to submit malicious messages that are stored persistently and rendered to all visitors on every page load.
AnalysisAI
Stored XSS in the Simple Ajax Chat WordPress plugin (all versions ≤ 20260811) allows fully unauthenticated remote attackers to inject persistent JavaScript payloads that execute in every visitor's browser on every page load. The vulnerability is compounded by a nonce bypass: the WordPress nonce normally used to authenticate chat submissions is rendered in the public chat page DOM, enabling any anonymous attacker to extract and reuse it without logging in. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The Simple Ajax Chat plugin must be installed and active on the WordPress site, and the chat widget must be embedded on at least one publicly accessible page (which is its default and intended use case). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N yields a base score of 7.2. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Update to a version of the Simple Ajax Chat plugin released after 20260811, which contains the fix committed to the WordPress.org SVN repository per changeset revision 3669278 (from 3640838). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Disable and remove Simple Ajax Chat plugin from all WordPress installations; search chat message logs for JavaScript injection patterns; enable WordPress security scanning. …
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External POC / Exploit Code
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